HOMOGENEOUS IONIC EQUILIBRIA 



223 



the isohydric principle; that is, assuming Equation 51. The results are 

 given in Table LXXXIII, in which the concentrations of sodium chloride 

 and hydrochloric acid are given in the second and third columns re- 

 spectively, and the measured specific conductance is given in the fourth 

 column. In the fifth column is given the specific conductance calculated 

 on the assumption of the iso-ionic principle, namely Equation 51, while in 

 the seventh column is given the value of the calculated specific conduct- 

 ance, assuming Equation 52. In the sixth and eighth columns are given 

 the percentage deviations between the measured and calculated values. 



TABLE LXXXIII. 



MEASURED SPECIFIC CONDUCTANCE OF MIXTURES OF NaCl AND HC1 COM- 

 PARED WITH VALUES CALCULATED ACCORDING TO EQUATIONS 51 AND 52. 



Concentration 

 (Approx.) 

 millimols 

 No. NaCl HC1 



Specific Conductance n 

 Calculated 



Equa- Calculated 



Measured tion 51 % Dif. Equation 52 



% Dif. 



2.1 

 1.6 

 1.4 

 1.0 

 0.6 

 0.3 



Mean 



13 

 14 

 15 

 16 



Mean 0.57% 



47.09 

 28.82 

 17.84 

 14.18 

 12.39 

 11.35 



Mean + 0.85% 



21.65 + 0.4 

 10.13 + 0;3 



6.221 



3.870 



3.094 



2.702 



Mean +0.33% 



5.646 + 0.1 



2.634 0.1 



1.619 + 0.1 



1.010 + 0.1 



Mean + 0.05% 



Comparing the measured values of the specific conductance with those 

 calculated on the basis of Equation 51, it is seen that the deviations from 

 the iso-ionic principle are consistently larger than any conceivable experi- 

 mental error. In the case of 0.1 normal solutions of sodium chloride, the 



